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bmv.c
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1 /*
2  * Discworld II BMV demuxer
3  * Copyright (c) 2011 Konstantin Shishkov
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
23 #include "avformat.h"
24 #include "internal.h"
25 
26 enum BMVFlags {
27  BMV_NOP = 0,
31 
32  BMV_AUDIO = 0x20,
33 };
34 
35 typedef struct BMVContext {
37  int size;
38  int get_next;
39  int64_t audio_pos;
40 } BMVContext;
41 
43 {
44  AVStream *st, *ast;
45  BMVContext *c = s->priv_data;
46 
47  st = avformat_new_stream(s, 0);
48  if (!st)
49  return AVERROR(ENOMEM);
52  st->codecpar->width = 640;
53  st->codecpar->height = 429;
55  avpriv_set_pts_info(st, 16, 1, 12);
56  ast = avformat_new_stream(s, 0);
57  if (!ast)
58  return AVERROR(ENOMEM);
61  ast->codecpar->channels = 2;
63  ast->codecpar->sample_rate = 22050;
64  avpriv_set_pts_info(ast, 16, 1, 22050);
65 
66  c->get_next = 1;
67  c->audio_pos = 0;
68  return 0;
69 }
70 
72 {
73  BMVContext *c = s->priv_data;
74  int type, err;
75 
76  while (c->get_next) {
77  if (s->pb->eof_reached)
78  return AVERROR_EOF;
79  type = avio_r8(s->pb);
80  if (type == BMV_NOP)
81  continue;
82  if (type == BMV_END)
83  return AVERROR_EOF;
84  c->size = avio_rl24(s->pb);
85  if (!c->size)
86  return AVERROR_INVALIDDATA;
87  if ((err = av_reallocp(&c->packet, c->size + 1)) < 0)
88  return err;
89  c->packet[0] = type;
90  if (avio_read(s->pb, c->packet + 1, c->size) != c->size)
91  return AVERROR(EIO);
92  if (type & BMV_AUDIO) {
93  int audio_size = c->packet[1] * 65 + 1;
94  if (audio_size >= c->size) {
95  av_log(s, AV_LOG_ERROR, "Reported audio size %d is bigger than packet size (%d)\n",
96  audio_size, c->size);
97  return AVERROR_INVALIDDATA;
98  }
99  if (av_new_packet(pkt, audio_size) < 0)
100  return AVERROR(ENOMEM);
101  memcpy(pkt->data, c->packet + 1, pkt->size);
102  pkt->stream_index = 1;
103  pkt->pts = c->audio_pos;
104  pkt->duration = c->packet[1] * 32;
105  c->audio_pos += pkt->duration;
106  c->get_next = 0;
107  return pkt->size;
108  } else
109  break;
110  }
111  if (av_new_packet(pkt, c->size + 1) < 0)
112  return AVERROR(ENOMEM);
113  pkt->stream_index = 0;
114  c->get_next = 1;
115  memcpy(pkt->data, c->packet, pkt->size);
116  return pkt->size;
117 }
118 
120 {
121  BMVContext *c = s->priv_data;
122 
123  av_freep(&c->packet);
124 
125  return 0;
126 }
127 
129  .name = "bmv",
130  .long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV"),
131  .priv_data_size = sizeof(BMVContext),
135  .extensions = "bmv",
136 };
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static int bmv_read_close(AVFormatContext *s)
Definition: bmv.c:119
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4882
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3900
int size
Definition: avcodec.h:1446
static int bmv_read_header(AVFormatContext *s)
Definition: bmv.c:42
static AVPacket pkt
#define AV_CH_LAYOUT_STEREO
uint8_t * packet
Definition: bmv.c:36
Format I/O context.
Definition: avformat.h:1351
int get_next
Definition: bmv.c:38
BMVFlags
Definition: bmvvideo.c:29
uint8_t
int width
Video only.
Definition: avcodec.h:3966
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
Definition: bmv.c:28
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1463
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4455
uint8_t * data
Definition: avcodec.h:1445
#define AVERROR_EOF
End of file.
Definition: error.h:55
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
Definition: bmv.c:30
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4002
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:648
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
AVInputFormat ff_bmv_demuxer
Definition: bmv.c:128
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
int64_t audio_pos
Definition: bmv.c:39
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3896
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:639
audio channel layout utility functions
#define s(width, name)
Definition: cbs_vp9.c:257
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:874
Definition: bmv.c:27
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
int av_reallocp(void *ptr, size_t size)
Allocate, reallocate, or free a block of memory through a pointer to a pointer.
Definition: mem.c:163
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
GLint GLenum type
Definition: opengl_enc.c:105
Definition: bmv.c:29
Definition: bmv.c:35
int size
Definition: bmv.c:37
int sample_rate
Audio only.
Definition: avcodec.h:4010
Main libavformat public API header.
static double c[64]
int eof_reached
true if eof reached
Definition: avio.h:239
void * priv_data
Format private data.
Definition: avformat.h:1379
int channels
Audio only.
Definition: avcodec.h:4006
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:647
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1021
unsigned int avio_rl24(AVIOContext *s)
Definition: aviobuf.c:762
int stream_index
Definition: avcodec.h:1447
This structure stores compressed data.
Definition: avcodec.h:1422
static int bmv_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: bmv.c:71
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1438
Definition: bmv.c:32